CVE-2025-39958 (GCVE-0-2025-39958)

Vulnerability from cvelistv5 – Published: 2025-10-09 09:47 – Updated: 2026-10-21 12:37
VLAI
Title
iommu/s390: Make attach succeed when the device was surprise removed
Summary
In the Linux kernel, the following vulnerability has been resolved: iommu/s390: Make attach succeed when the device was surprise removed When a PCI device is removed with surprise hotplug, there may still be attempts to attach the device to the default domain as part of tear down via (__iommu_release_dma_ownership()), or because the removal happens during probe (__iommu_probe_device()). In both cases zpci_register_ioat() fails with a cc value indicating that the device handle is invalid. This is because the device is no longer part of the instance as far as the hypervisor is concerned. Currently this leads to an error return and s390_iommu_attach_device() fails. This triggers the WARN_ON() in __iommu_group_set_domain_nofail() because attaching to the default domain must never fail. With the device fenced by the hypervisor no DMAs to or from memory are possible and the IOMMU translations have no effect. Proceed as if the registration was successful and let the hotplug event handling clean up the device. This is similar to how devices in the error state are handled since commit 59bbf596791b ("iommu/s390: Make attach succeed even if the device is in error state") except that for removal the domain will not be registered later. This approach was also previously discussed at the link. Handle both cases, error state and removal, in a helper which checks if the error needs to be propagated or ignored. Avoid magic number condition codes by using the pre-existing, but never used, defines for PCI load/store condition codes and rename them to reflect that they apply to all PCI instructions.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 59bbf596791b89c7f88fdcac29dfc39c1221d25d , < 3b32cf6e279597d1b6477fb89d46abf65263c139 (git)
Affected: 59bbf596791b89c7f88fdcac29dfc39c1221d25d , < 79fa3a19aa6114189b33e2ba1f393b0f635d7544 (git)
Affected: 59bbf596791b89c7f88fdcac29dfc39c1221d25d , < 359613f2fa009587154511e4842e8ab9532edd15 (git)
Affected: 59bbf596791b89c7f88fdcac29dfc39c1221d25d , < 9ffaf5229055fcfbb3b3d6f1c7e58d63715c3f73 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.114 , ≤ 6.12.* (semver)
Unaffected: 6.16.9 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\niommu/s390: Hacer que la conexi\u00f3n tenga \u00e9xito cuando el dispositivo fue eliminado inesperadamente\n\nCuando un dispositivo PCI es eliminado con hotplug por sorpresa, todav\u00eda puede haber intentos de conectar el dispositivo al dominio predeterminado como parte del desmantelamiento a trav\u00e9s de (__iommu_release_dma_ownership()), o porque la eliminaci\u00f3n ocurre durante la sonda (__iommu_probe_device()). En ambos casos, zpci_register_ioat() falla con un valor cc que indica que el identificador del dispositivo es inv\u00e1lido. Esto se debe a que el dispositivo ya no forma parte de la instancia en lo que respecta al hipervisor.\n\nActualmente esto lleva a un retorno de error y s390_iommu_attach_device() falla. Esto activa el WARN_ON() en __iommu_group_set_domain_nofail() porque la conexi\u00f3n al dominio predeterminado nunca debe fallar.\n\nCon el dispositivo cercado por el hipervisor, no son posibles DMAs hacia o desde la memoria y las traducciones IOMMU no tienen efecto. Proceder como si el registro hubiera sido exitoso y dejar que el manejo del evento hotplug limpie el dispositivo.\n\nEsto es similar a c\u00f3mo se manejan los dispositivos en estado de error desde el commit 59bbf596791b (\u0027iommu/s390: Hacer que la conexi\u00f3n tenga \u00e9xito incluso si el dispositivo est\u00e1 en estado de error\u0027) excepto que para la eliminaci\u00f3n el dominio no ser\u00e1 registrado m\u00e1s tarde. Este enfoque tambi\u00e9n fue discutido previamente en el enlace.\n\nManejar ambos casos, estado de error y eliminaci\u00f3n, en una funci\u00f3n auxiliar que verifica si el error necesita ser propagado o ignorado. Evitar c\u00f3digos de condici\u00f3n de n\u00fameros m\u00e1gicos utilizando las definiciones preexistentes, pero nunca usadas, para los c\u00f3digos de condici\u00f3n de carga/almacenamiento PCI y renombrarlas para reflejar que se aplican a todas las instrucciones PCI."
          }
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        "id": "CVE-2025-39958",
        "lastModified": "2026-10-21T13:18:17.850",
        "metrics": {
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                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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              "source": "nvd@nist.gov",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: iommu/s390: Make attach succeed when the device was surprise removed",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39958.json",
      "version": "3"
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}



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